Lifting-jack



J. BERG.

urnm; JACK. APPLICATION FILED NOV; 27. I920.

. 1,396,3 1 4, Patented Nov. 8, 1921.

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n cl 2 632m UNlTED STATES JOSEPH BERG, OF LITTLE ROCK, ARKANSAS.

LIIETING-JACK.

Application filed November 27, 1920.

To all to 710m it may concern:

Be it known that I, Josnrrr Brno, a citi zen of the United States, and a resident of Little Rock, in the county of Pulaski and State of Arkansas, have invented new and useful Improvements in Liftin racks. of which the following is a specification.

My invention relates to jacks for use by automobilists in lifting an axle so that the wheel will be raised from the ground to permit a tire or the wheel to he changed or repaired.

The invention seeks to provide a device for stated purpose which may be easily placed in operative position and manipulated without requiring the operator to get under the car or to be subjected to other inconvenlence.

The invention also seeks to provide a 2' ck by the use of which the desired lifting ac tion will be effected easily and quickly, and the invention further seeks to provide a device which, when not in use, may be easily stored in the tool box in a small space.

All these objects are attained in such a device as is illustrated in the accompanying drawings and the invention consists in certain novel features which will be hereinafter first fully described and then particularly pointed out in the appended claims.

In the drawing, wherein corresponding numerals of reference are used to indicate corresponding parts in each of the several views Figure l is a sectional elevation of my improved jack, and

Fig. 2 is a detail elevation of the outer lifting screw.

In carrying out my invention, I employ a hollow standard 1, having a relatively wide, solid base 2, so that it will rest firmly on the ground, without an excessive tendency to tilt and fall. 1 The upper end of the standard is internally threaded as shown at 3, and a. lateral arm t extends from the standard near its upper end, said arm having an upturned extremity providing a hearing for the operating shaft or handle. It will be. readily noted, upon reference to Fig. 1, that the bearing is divided vertically so that the shaft may be inserted from the side thereby adding to the convenience of the device. Extending through and engaged in the in ternally threaded portion 3 of the standard is the outer screw 5, which is hollow and Sp ccification of Letters Patent.

Serial No. 426,677.

has an internally threaded head portion 6, which receives the externally threaded inner screw Resting upon and fitting around the upper or head end of the standard is a. bevel gear 8 having its hub portion 9 fitting around the end or head of the outer screw. A feather 10 is secured in the hub S) anal cngages a longitudinal groove 11 in the outer screw so that while rotation of the ear will effect rotation of the screw, the screw will be permitted to move longitudinally by reason of its engagement with the head or nut portion 3 of the standard. ()ne of the screws is right handed and the other is left handed and it will be readily noted that the threads of the inner screw are coarser than those of he outer screw, so that a few turns of the outer screw will effect the desired elevation of the inner screw. It will also be noted that the inner screw will be set in motion simultaneously with the outer screw so that the jack acts instantly, without any waste of time, and with the expenditure of slight effort. The inner screw is provided at its up per end with a fixed supporting head 12, and a restraining brace 13 is pivoted at one end to the said head and at its opposite end to a sleeve 1 1 fitted slidably on the operating shaft 15. The inner screw is thus held against turning and the entire force applied to it'is converted into longitudinal movement so that it is rapidly elevated. The operating shaft is provided at one end with a beveled pinion 16 meshing wlth the gear 8 and at the opposite end of the shaft is a handle 17, whereby rotary motion may be imparted to the gear 8 in an obvious manner.

The operating shaft is composed of a plurality of sections detachably fitted together, so that, when the device is not in use, the sections may be separated and fitted in the tool box so as to economize space therein. The handle is provided midway its ends with a socket 18 having a longitudinal slot 19 to engage a stud 20 on the outer shaft section 21, which at its inner end is constructed with a longitudinal slot 22 to engage a stud 23 on the reduced outer end of the intermediate shaft section 2 1, said reduced end of section at fitting within the end of the section 21 as will be readily understood. The opposite end of the section 24 fits over the end of the gear carrying section 25 and is constructed with a longitudinal slot 26 to engage a stud fa'tented Nov. 8, F521,

27 on the section 25. It Will thus be seen that the sections of the shaft may be easily fitted together or separated and that when they are fitted together power may be applied to and through them positively.

It is to be particularly noted that the operating shaft and the restraining brace may be utilized as a handle device to place the jack under a vehicle and it is unnecessary for the operator to get under the vehicle or to subject himself to any appreciable discomfort or inconvenience in order to bring the ack into the proper position for use.

The jack is very simple in constructiton and is direct and positive in action.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. A jack comprising a hollow standard having a lateral arm near its upper end, an outer screw mounted in the standard, an inner screw mounted in the outer screw, a gear fitted around and supported by the upper end of the standard and connected With the outer screw to rotate the same While permitting relative longitudinal movement thereof, an operating shaft mounted on the lateral arm of the standard and operatively connected to said gear, and a restraining brace pivoted at one end to the head of the inner screw and having a slidable connection at its opposite end with the operating shaft.

2. A jack comprising a standard, inner and outer screws mounted in said standard, gearing supported on the standard for operating said screws including a laterally extending shaft, a slidable sleeve on the said shaft, and a restraining brace pivoted at one end to the head of the inner screw and at its opposite end to the said sleeve.

JOSEPH BERG. 

